At least one competitor has agreed to the bout, an event source told MMAjunkie.com (www.mmajunkie.com). The Canadian Press‘ Neil Davidson first tweeted news of the fight on Monday.

UFC 140 takes place Dec. 10 at Air Canada Centre in Toronto.

The night’s main card airs live on pay-per-view, though it’s not clear if Lentz vs. Bocek will be part of the broadcast.

Lentz looks to extend his current undefeated streak to 16 fights following a 12-0-2 run (with one no-contest) since 2007. The Minnesota Martial Arts Academy fighter picked up UFC wins over Rafaello Oliveira, Rob Emerson, Andre Winner, Tyson Griffin and Waylon Lowe, and he fought Thiago Tavares to a majority draw. However, in his most recent bout, which earned “Fight of the Night” honors, he took an illegal knee from UFC on Versus 4 opponent Charles Oliveira and subsequently was tapped out. But because the ref missed the illegal blow, the Pennsylvania State Athletic Commission quickly overturned the loss to a non-contest.

Bocek, meanwhile, had put together an impressive 4-1 run in the UFC (which included a pair of “Submission of the Night” bonuses over Joe Brammer and Dustin Hazelett). However, back in April at UFC 129, the Brazilian jiu-jitsu black belt suffered a unanimous-decision loss to top contender Ben Henderson at UFC 129. His only losses in the UFC now have to notables Henderson, Jim Miller, Mac Danzig and current champ Frankie Edgar.

The latest UFC 140 card includes:

Frank Mir vs. Antonio Rodrigo Nogueira

Antonio Rogerio Nogueira vs. Tito Ortiz

Brian Ebersole vs. Rory MacDonald

Mark Bocek vs. Nik Lentz*

Rich Attonito vs. Claude Patrick

Dennis Hallman vs. John Makdessi*

John Cholish vs. Mitch Clarke

* – Not officially announced

For more on UFC 140, stay tuned to the UFC Rumors section of MMAjunkie.com.
(Pictured: Nik Lentz)